linux-kernel - Re: arch/x86/kvm/svm/sev.c:1605:30: warning: parameter 'role' set but not used

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Date:   Mon, 13 Jun 2022 09:34:15 -0600
From:   Peter Gonda <pgonda@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        LKML <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: arch/x86/kvm/svm/sev.c:1605:30: warning: parameter 'role' set but
 not used

On Mon, Jun 13, 2022 at 5:03 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi Peter,
>
> FYI, the error/warning still remains.
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   b13baccc3850ca8b8cccbf8ed9912dbaa0fdf7f3
> commit: 0c2c7c069285374fc8feacddc0498f8ab7627117 KVM: SEV: Mark nested locking of vcpu->lock
> date:   5 weeks ago
> config: x86_64-buildonly-randconfig-r005-20220613 (https://download.01.org/0day-ci/archive/20220613/202206131853.x4KJwC5Q-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d378268ead93c85803c270277f0243737b536ae7)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c2c7c069285374fc8feacddc0498f8ab7627117
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 0c2c7c069285374fc8feacddc0498f8ab7627117
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kvm/ drivers/media/platform/qcom/camss/
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> arch/x86/kvm/svm/sev.c:1605:30: warning: parameter 'role' set but not used [-Wunused-but-set-parameter]
>                                            enum sev_migration_role role)
>                                                                    ^
>    1 warning generated.
>
>
> vim +/role +1605 arch/x86/kvm/svm/sev.c
>
>   1603
>   1604  static int sev_lock_vcpus_for_migration(struct kvm *kvm,
> > 1605                                          enum sev_migration_role role)
>   1606  {
>   1607          struct kvm_vcpu *vcpu;
>   1608          unsigned long i, j;
>   1609          bool first = true;
>   1610
>   1611          kvm_for_each_vcpu(i, vcpu, kvm) {
>   1612                  if (mutex_lock_killable_nested(&vcpu->mutex, role))
>   1613                          goto out_unlock;
>   1614
>

I am confused about this warning. |role| is used on this line above.
Is this because CONFIG_DEBUG_LOCK_ALLOC the subclass argument is
dropped in the macro?